'MyOption.UseShakaPackager' is obsolete: 'Use DecryptionEngine instead'

'MyOption.UseShakaPackager' is obsolete: 'Use DecryptionEngine instead'

'ServicePointManager' is obsolete: 'WebRequest, HttpWebRequest, ServicePoint, and WebClient are obsolete. Use HttpClient instead. Settings on ServicePointManager no longer affect SslStream or HttpClient.' (https://aka.ms/dotnet-warnings/SYSLIB0014)

The variable 'e' is declared but never used

Possible null reference argument for parameter 'hex' in 'byte[] HexUtil.HexToBytes(string hex)'.

The variable 'sawMDAT' is assigned but its value is never used

Non-nullable field 'rawText' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.